Express Water &ndash; 2 Pack Reverse Osmosis Membrane &ndash; RO Membrane 100 GPD Water Filter Replacement &ndash; Under Sink and Reverse Osmosis System Protect your Water - Remove up to 99.99% of Heavy Metals, Total Dissolved Solids (TDS), Bacteria, Arsenic, Chlorine, Cadmium, Pyrogens, Giardia, Viruses, Cyanide, and more High Standard Filtration - Verified by independent laboratory testing to meet NSF / ANSI 58 Standard The Best Filtration - Density graded membrane film ensures that you get the most filtration and surface area coverage Universal Standard Size - 50 GPD Reverse Osmosis Membrane, fits all standard 2 Outer Diameter (OD) membrane housing 11.75 X 1.75 Made to Last - Airtight vacuum sealed packaging prevents spoiling of your filter Compact high density graded membrane layers make this the highest contaminant reduction rated Reverse Osmosis Membrane Catches contaminants as small as 0.0001um (1/10,000th of a micron) like microorganisms and viruses Fast 100 Gallons Per Day filtration Made with 100% FDA approved food grade material. Inner layers made from polyamide thin-film composite High rejection rate of: Chlorine, Total Organic Carbon (TOC), Benzene, Industrial Solvents, Turbidity, Pesticides, and Chemicals causing bad tastes and odors Density grading of the membrane layers gives your filtration the most surface area which means your filter catches more contaminants and lasts longer giving you the best value in filtration Tested and verified by independent laboratories, complies with NSF / ANSI Standard 58 A high capacity RO Membrane improves removes up to 99% of contaminants from your water, improves taste, and gives you the best value from your system Standard 11.75 X 1.75 size fits most reverse osmosis (RO) systems Free lifetime support Have any questions about your system or your homes water answered by experts